1. Associate Professor, College of Economics and Management, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 211106, PR China; Associate Professor, Research Centre for Soft Energy Science, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 211106, PR China.
2. Graduate Student, College of Economics and Management, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 211106, PR China; Research Centre for Soft Energy Science, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 211106, PR China.
3. Postdoctor, School of Civil Engineering, Southeast Univ., Nanjing 211189, PR China (corresponding author).